Creating and Calling Procedures Alice 3 Beta

Creating and Calling ProceduresAlice 3 Beta

A few choices to be madeRight window, upper left hand corner start by

clicking on Class “MyScene” button

1.Click “class”

2 Click MyScene

3 Click Procedures 4 Click

Declare Procedure

After requesting to create a procedure, Name it (any legal name)

New Tab appears named with your new method name

This example will use a parameter to be passed into method when the method is called

Click on Add Parameter button

Next click on Value Type arrow

This example will use an integer

Many other types are available

This example “howHigh” keyed in as name of integer parameter

Any legal name OK , name should relate to purpose of parameter

Continue by clicking “OK” button

New Button “howHigh” appears and “Add Parameter” button may be used to create other

parameters as needed

“howHigh”Add Parameter

Many tiles can be dragged to the right in this example a Princess “move” was chosen

This example chose “UP”

Princess “Move”

A number (an integer) place holder is picked 1.0 in this example

Result of last 1 integer choice (1.0 is really just 1 an integer)

Example Princess will move up 1 meter

Integer “howHigh” button dragged toward the 1.0 placeholder

Target for howHigh parameter

“howHigh” dropped off on top of 1.0 replacing it

Click on “run X” tabThen click on This a.k.a. Scene

Find the method you want to call “princessMethod” in this example drag the tile to the right window

Choose an integer “meters Princess will move UP” in this example “3” chosen as demonstration

Result tile on right below an existing instruction. Call to princessMethod passing 3 “howHigh”

parameter

Next run program

Result: Princess moves UP too far

Call adjusted to “2” meters UPre-run program

Princess now completely in frame

Example has worked Method called correctly, adjusted when necessary

• The method may be called many times and passed the same parameter (argument) or a different one each call.